Alexander davidson



(No Model.) 1

A. DAVIDSON. TYPE WRITING MACHINE.

Patented Nov.

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UNITED STATES PATENT OFFICE.

ALEXANDER DAVIDSON, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO THE YOST IVRITING MACHINE COMPANY, OF NEW YORK, N. Y.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 487,066, dated November 29, 1892.

Application filed April 3, 1888.

To all whom it may concern:

Be it known that I, ALEXANDER DAVIDSON, a citizen of the United States, and a resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates more particularly to that class of lever type-writing machines in which a center guide or directrix is employed,

.and by which a more perfect alignment of the printing may be obtained. In machines of this description it is not necessary to pivot the radiating type levers or carriers with the precision and nicety required in machines devoid of a center guide, for'any slight inaccuracies in pivoting or occurring in time by reason of wear of the carrier journals or bearings are corrected by the center guide as the type pass therethrough on their way to effect an impression upon the paper of the platen.

As machines containing a center guide have heretofore been constructed the type levers or carriers have been made of a single piece, with the type mounted rigidly at one end thereof, and as thus constructed the corrections in adjustment or alignment of the typelevers have been effected in the center guide by a movement of the type levers or carriers bodily, which in a measure destroys the momenta of the carriers, and hence the force of impression, besides increasing the resistance at the finger-keys and making the touch more difficult and laborious.

My invention has for its main object to overcome these objections in previously-made machines; and to this end it consists, primarily, in certain features of construction and combinations of devices, all of which will be hereinafter more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings, forming a part of this specification, Figure 1 is a vertical section of a type-writing machine embodying my invention. Fig. 2 is a detail View of the center guide, a type-holder, type-carrier, connecting-rod, andhanger or support. Fig. 3 is a detail view of the inner end of the typelever. Fig. 4 is a view similar to that shown at Fig. 2, with the moving parts in a different Serial No. 269,446. (No model.)

position. Fig. 4* is a section taken at the line w a: of Fig. 4. Fig. 5 is a detail View of a modification of my invention. Fig. 6 is a sectional elevation of the same. Fig. 7 is a detail view of another modification of my invention. Fig. 8 is a vertical section taken at the line y y of Fig. 7, and Fig. 9 is a side ele- 'vation of the type-holder shown in the lastnamed figure.

In the several views the same part will be found designated by the same letter or numeral of reference.

I shall first refer to Figs. 1 to 4".

A represents the paper-carriage, which may be of any approved construction; B, the top plate or type-ring of the machine, which is supported by posts 0, secured to the bedplate D, beneath which the key-levers E are pivoted in substantially the well-known way.

F represents the finger-keys attached to the forward ends of the key-levers E. Around the top plate are secured hangers G, in the bifurcated inner ends of each of which is pivoted the type-carrier arm or lever 2, to the shorter portion of which, preferably, is attached the upper end of a connecting-rod 3, whose lower end is connected'to the key-lever E. The type end of each type-carrier is bent downwardly or provided with an extension 4 and is formed with around hole 5 and an oblong hole or slot 6.

7 designates a type socket or holder provided with a cavity or opening for the reception of the shank of a type 8 and bifurcated at its lower end to straddle the extension of the carrier or arm 2. The bifurcated portion of the type-holder is perforated with round holes at such a distance apart as to coincide with the holes 5 and 6 when the holder is set astride the carrier. Small Wire pins 9 and 10 are passed through the holes in the carrier and in the type-holder and are riveted at their ends. The lowermost pin 9, in line with the axis of the type-holder and center guide, acts as a pivot'for the type-holder, which may vibrate longitudinally of the type-bar to either side of a line coincident with the axis of the center IOO 9 th'ectype-carrieris slotted or'formed ofu twoi I ter guide H; In this view the typehold-er is. shown vibrated-forward and the pin 10 against the front end of the slot. As the upward movement of the carrier is continued the type will slide along on the beveled wall of the guide and the type-holder be vibrated backward slightly on the pivot 9." Whentlie upward" movement of the carrier has been eifected' to the full extent, the face of the type will have passed through the guide and the type-holder been moved to the position illustrated at Fig. 4, in which view it will be observed that the vertical axis of the type-holder andtha-t of-theguide are in line or coincide, the pin 10 standing in the center of the slot 6: When-the" parts are in this position and the type-body fills or fits snugly in the upperor narrow endx ot' 'the' guide-openinggthe alignmenti ofr thee printing will approximate perfection.-

as correctly assembled, and if the type-holder were made rigid or of a piece wit'hr the carrier the alignment. of the printin g would fiora time i be satistactoryg butin 'assemblingzthe car; :riers of a type-Writing machine considerable time and skill are required to get thetyper-fcarr; riers intw this accurate position, and :Eeven." when thus fitted they will in use =wear at th.e ir=. pivots or fulc'rums or joints. anda get out of truew. While thisimperfectionin itself' isaun'a objectionable; because of I the ability .Of the 1 cen ter' guide to a make I the correction;- as the but: simplyqthe small type holdingportion on:'

socket; which, being light and pivoted, moves"; with the utmost ease andwithoutapercepti'bly J decreasin the :force of impression -or increas ing-:the touch 'atthe finger-keys In the modification shown at Figsw5 and 6 the extension ot the carrier "is provided with one hole' only,-and in lieu otathehole' orslot 6 and pin=10 two projections ll form'ed-upon the upperaside or edge of the carrier, are used;

The type-holder :is preferablybifurcated at its lower end; as inFig...2,'=and provided with 1 perforations in line with the-holexo :inathc car-1' rierifor: the introductiomof the: pivot-pin 9. It wi-lllbe understoodgrof course, than the pro-1- jections 11, like the slot and pin-i6 10,"serveto keep the type-holder. in position and: limit its r vibration.

In the modification shown at Figs'."7,8,and:

piecessheldapart and the type-holder provided: with a 'thin shank to fit into the .slot' or: the

opening-.in-the carricn: The innerfend of the; carrier; isturnedup instead 0f"d0Wl],a.SiiI1"the'- rier. Apivot-pin 9 is passed through the lower At-Figsz' fl and 4t the type-car-riier is shownu holes. The type-holder is provided with an oblong. hole or slot and with a round hole the same distance apart as the holes in the carset of holes and a stop-pin 10 through the uppersetof holes.

l The operation of the modifications shown at Figsa- 5 to 9, inclusive, is thesame as that shown in the other figures.

; Theatype-carrier and the type-holder may be of any detail construction and may be hinged, pivoted, or jointed in any desired =mannerusoafaras my improvement is concerned, and changes in the center guide and in the 'shapepf thetype and in its mode of mounting or attachment, as well as changes in the general organizatiomof ttheima'chineg may be= i made zwi'thoirtttdepar-ting d'romzitth'e. spirit ofinvention. What: I claim ias't n ewg and g desire. to secures byfLetters' Paten t,'isr- 1. in a typewritingmachine; the.'co'rrrhina-'ation, with a center igui'de, of a :type-ban'havw ing a pivotally-connected type freevto vtbi'ate3 o longitudinally of the type 'barain either; direct." tion, whereby .the type may be automatieazllylfi adjhsted in and adoring its-:3:passa;g1eCthroughb the center guideindependently ofithe' type-s; bar-, andvm'eans for. lillli-llillg the said avtbra-zi 9 5 tion's;

2.:In' 2a 'typewr-iting machine, the combines-7i ti'on', iwith a i'cent'er guide; ot'c' a :type-loarv iand' i' a type holder pivotally connectedosubstana tially eatright tangles to csa-id :type'-ba-r;1the.:1 oo

pivobofthe. type-holden-beingsn-bstantially coincident withwthe axis of the type-holder 1' and the mentor Y guideandithew type=holider1 I beingconstructed and armangedtohaveatree but liinited ivibratory motioni longitudinally I0 5 of thestyp'e bar to bothi sides ofi a =li'ne drawn'n through itstaxiswhenstanding in arvertical position *or coincident with the axis 'of the centerguide. i

3. *In con binationpaaype ban iprovidedi'at r 10 one end wit'h a pivoted type-holder and m'eansgfl substantially i as fdescri'bed, for= lim itingther vibrationsof'the ty-pe holder.

twln a itype wr-itin g machine, the combina ti'ong-with'a center guide; of aftypebar pro- 1 I 5 vided: at e'one end with a pivoted type-holder: and a type fitted thereto? 5."In a type-writing machineythefcom bina tionpwi'thi ar center'guidegof 'a typedean pro videdation'e end with-:az-lpivoted typesholder:i1 2o and rmeansyisubstanti'ally 5 as described,"-;for limiting the-vibration oftthetypeholdera 6;"In a type-writing :m ach=ine-,#the combina tion, withaa .i cen-ter guide,: of I a type ban providsed-iat ione end with a self-adj us-tinggtype I 25 holde'nandia .type fitted thereto;

7. In 2atype writing:machine; the com-bina v tionpwith a center guideyof a: type-ban "pro vided at :one endwithia self adjusti-ng itypew holder and faztype: fitted Lthereto and" means for limiting ihe m'overnent 'of the same:

8. Ina typewriting :machin e, a type ba'r hav ing at one end an extension arranged at an angle to the bar and having a type-holder pivoted to said extension.

9. In a type-writing machine, a type-bar having at one end an extension arranged at an angle to the bar, having a type-holder pivoted to said extension, and having means for limiting the vibration of the pivoted type-holder.

10. In a type-writing machine, in combination with a type-bar having at one end an extension arranged at an angle to the bar and having also a stop, a type-holder pivoted to said extension and provided with a slot which ALEX. DAVIDSON.

Witnesses:

M. LAYDEN, J AOOB FELBEL. 

